Systems and methods for conveying and determining modulations schemes employed by co-scheduled users are disclosed. In addition, methods and systems for designing signaling schemes that convey such information are also disclosed. In accordance with one method, an index is received and a table of indices in which the received index denotes a plurality of different sets of modulation schemes is referenced. Further, one or more modulation schemes of at least one co-scheduled user is determined based on the referencing. In addition, data signals are received and are processed by utilizing the one or more modulation schemes.
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1. A method for determining modulation information of co-scheduled users, the method comprising: receiving an index; referencing a table of indices in which the received index denotes a plurality of different sets of modulation schemes, a total number of co-scheduled streams, and denotes one or more stream indices for a given user to which the received index is directed; determining at least one modulation scheme of at least one co-scheduled user based on the referencing; and receiving data signals and processing the data signals by utilizing the at least one modulation scheme.
A method for determining how co-scheduled users are modulating their data. The method involves: Receiving an index number. Using this index to look up a table. The table contains indices, where each index corresponds to multiple sets of modulation schemes, the total number of co-scheduled data streams, and stream indices for a specific user. Based on this table lookup, determining the modulation scheme used by at least one of the co-scheduled users. Finally, receiving the actual data signals and processing them using the determined modulation scheme.
2. The method of claim 1 , wherein the determining further comprises selecting a set of modulation schemes from the plurality of different sets based on the one or more stream indices denoted by the received index in the table and based on a known modulation scheme for the user to which the received index is directed.
This method builds on the previous modulation scheme determination method. The "determining" step involves selecting a modulation scheme from a set of possible schemes found in the table lookup. The selection is based on stream indices, which are indicated by the received index, and on a known modulation scheme already in use by the user to which the received index is directed. In other words, the user knows their own modulation scheme, and uses the index to discover the modulation scheme of the other co-scheduled user(s) by eliminating schemes that are incompatible with their own.
3. The method of claim 2 , wherein each set of the plurality of different sets of modulation schemes conveys a corresponding stream index for each of the modulation schemes in the respective set.
Further specifying the modulation scheme determination method, each set of modulation schemes also includes information about the stream index associated with each modulation scheme within that set. So, each modulation scheme is linked to a specific stream index allowing for streams to be differentiated.
4. The method of claim 2 , further comprising: receiving a separate signal denoting the known modulation scheme.
Further specifying the modulation scheme determination method, the known modulation scheme used by the user is obtained from a separate signal received by that user. Instead of being pre-configured or derived from the main index, the user's initial modulation information is sent directly.
5. The method of claim 2 , wherein the known modulation scheme is denoted by the received index.
Further specifying the modulation scheme determination method, the known modulation scheme used by the user is indicated directly by the received index. The same index used to find the other user's modulation also reveals the receiver's own modulation information, thus eliminating the need for a separate signal.
6. The method of claim 1 , further comprising: referencing a listing of sets of modulation schemes including the plurality of different sets of modulation schemes to determine the at least one modulation scheme of the at least one co-scheduled user, wherein the sets of modulation schemes in the listing are structured in accordance with splits and wherein a split is a sequence of total numbers of streams respectively allocated to any given co-scheduled users that is arranged in decreasing order.
Building upon the base method for determining the modulation scheme of co-scheduled users, this improvement uses a list of modulation scheme sets to determine the at least one modulation scheme of at least one co-scheduled user. The sets of modulation schemes within the list are structured according to "splits". A split represents a decreasing sequence of the total number of streams assigned to each co-scheduled user. The lookup table contains indices which point to a plurality of different sets of modulation schemes.
7. The method of claim 6 , wherein each set in the listing is ordered in accordance with the stream indices and wherein each set in the listing is permutable such that stream indices of modulations assigned to co-scheduled users having a common total number of allocated streams are swappable without affecting a total number of indices of the table of indices and without affecting a total number of modulation scheme combinations that are conveyable by the table.
This addition to the modulation scheme determination method structures the listing of modulation schemes. Each set is ordered according to stream indices. The stream indices of modulations assigned to users sharing the same total number of streams are interchangeable. This swapping should not change the total number of indices in the lookup table or the total number of modulation scheme combinations that the table can convey. The ordering and swapping maintains efficiency and minimizes lookup table size.
8. A system for conveying modulation information of co-scheduled users, the system comprising: a scheduler configured to determine a set of co-scheduled users, a respective total number of streams for each of the users, and a respective modulation scheme for each of the users; a controller configured to reference a listing of sets of modulation schemes to determine a set of modulation schemes that conforms to the determined total numbers of streams for each of the users and conforms to the determined modulation schemes for each of the users and configured to reference a table of indices in which each index of a plurality of the indices denotes a respective plurality of different sets of modulation schemes in the listing to select indices from the table for transmission to the co-scheduled users that denote the determined set of modulation schemes, a total number of co-scheduled streams, and denotes one or more stream indices for a given user for which the given index is selected; and a transmitter configured to transmit a different one of the selected indices to each of the respective users to permit each of the users to determine the modulation schemes assigned to at least one other co-scheduled user.
A system for communicating modulation information between co-scheduled users includes: A scheduler that determines the co-scheduled users, the number of data streams each user will have, and the modulation scheme for each user. A controller that references a list of possible modulation scheme sets to find one matching the scheduler's assignments. This controller then uses a lookup table (where each index corresponds to a combination of modulation schemes) to select indices to transmit to the users. These indices denote the determined set of modulation schemes, the total number of co-scheduled streams, and stream indices for the user. A transmitter sends a unique index to each user, enabling them to determine the modulation scheme(s) used by other co-scheduled users.
9. The system of claim 8 , wherein each given set in the respective plurality of different sets of modulation schemes indicates a corresponding stream index for each of the modulation schemes in the given set.
In the modulation information communication system, each set of possible modulation schemes indicates the corresponding stream index for each of the modulation schemes within that set. The stream index information allows each co-scheduled user to understand the relationship between streams and their associated modulation schemes.
10. The system of claim 9 , wherein the sets of modulation schemes in the listing are structured in accordance with splits and wherein a split is a sequence of total numbers of streams respectively allocated to any given co-scheduled users that is arranged in decreasing order.
In the modulation information communication system, the sets of modulation schemes are organized in a listing based on "splits". A split is a sequence of the number of streams assigned to co-scheduled users, arranged in decreasing order. This organization allows for structured selection of the appropriate sets of modulation schemes to use for co-scheduled user communication.
11. The system of claim 10 , wherein each set in the listing is ordered in accordance with the stream indices and wherein each set in the listing is permutable such that stream indices of modulations assigned to co-scheduled users having a common total number of allocated streams are swappable without affecting a total number of indices of the table of indices and without affecting a total number of modulation scheme combinations that are conveyable by the table.
Further detailing the modulation information communication system, each set in the listing is ordered by stream indices. The sets are structured to be permutable such that stream indices of modulations assigned to co-scheduled users sharing a common total number of streams can be swapped. The swapping does not impact the total number of indices in the table or the number of modulation scheme combinations that the table can convey.
12. A non-transitory computer readable storage medium comprising a computer readable program, wherein the computer readable program when executed on a computer causes the computer to perform a method for designing a signaling table to convey modulation information of co-scheduled users, the method comprising: determining possible combinations of modulation schemes for a total number of users based upon splits, wherein a split is a sequence of total numbers of streams respectively allocated to co-scheduled users that is arranged in decreasing order; and allocating indices to the determined combinations to generate the signaling table for use in conveying to a given user modulation schemes employed by users that are co-scheduled with the given user.
A non-transitory computer-readable storage medium contains a program. When executed, this program designs a signaling table to convey modulation information of co-scheduled users. The process involves: Determining possible combinations of modulation schemes for a number of users. This determination is based upon "splits", where a split is a decreasing sequence representing the number of streams allocated to co-scheduled users. Allocating indices to these determined combinations to create the signaling table. The table is then used to communicate the modulation schemes used by other co-scheduled users.
13. The non-transitory computer readable storage medium of claim 12 , wherein the determining further comprises determining combinations of modulation schemes for each split in a successive order of splits such that a given split having a number of modulation schemes that is larger than a number of modulation schemes of an other split that succeeds the other split.
This storage medium builds upon the method of designing a signaling table by determining combinations of modulation schemes for each split in a specific order. A split with a larger number of modulation schemes is handled before a split with a smaller number of modulation schemes. This order could optimize the table creation process, for example, by prioritizing more complex scenarios first.
14. The non-transitory computer readable storage medium of claim 12 , wherein the allocating further comprises allocating the indices for each split in a preceding order of splits such that a given split having a number of modulation schemes that is less than a number of modulation schemes of an other split that precedes the other split.
In the storage medium the indices are allocated for each split in a specific order, such that a given split having fewer modulation schemes is handled before a split with more modulation schemes. This processing order may optimize the table building process.
15. The non-transitory computer readable storage medium of claim 12 , wherein the method further comprises: arranging the determined combinations of modulation schemes in a listing such that the difference, in each column of the listing, between the numbers of instances of each modulation type is minimized.
This enhancement to the storage medium's method of designing the signaling table involves arranging the determined combinations of modulation schemes in a list. The arrangement minimizes the difference, in each column of the listing, between the counts of each modulation type. This balancing of modulation types optimizes resource allocation or reduces interference.
16. The non-transitory computer readable storage medium of claim 12 , wherein the generated signaling table includes at least one index that denotes a plurality of different combinations of modulation schemes.
Adding to the storage medium implementation, the generated signaling table contains at least one index that represents multiple combinations of modulation schemes. This strategy reduces the table's overall size, as a single index efficiently communicates a range of modulation scheme possibilities.
17. The non-transitory computer readable storage medium of claim 16 , wherein a particular combination in the plurality of different combinations denoted by the at least one index is conveyable to a particular user by means of a known modulation scheme assigned to the particular user that is in the particular combination.
The storage medium further specifying the generated signaling table, a particular combination out of the plurality of different combinations (denoted by an index) can be conveyed to a particular user by utilizing a known modulation scheme of that user. The known modulation scheme acts as a filter, allowing the user to identify the appropriate combination from the options provided by the index.
18. The non-transitory computer readable storage medium of claim 12 , wherein each of the determined combinations is ordered in accordance with stream indices and wherein each set in the listing is permutable such that stream indices of modulations assigned to co-scheduled users having a common total number of allocated streams are swappable without affecting a total number of indices of the signaling table and without affecting a total number of modulation scheme combinations conveyable by the table.
The storage medium ensures the combinations of modulation schemes are organized so each is ordered according to stream indices. The determined sets of modulations are permutable such that stream indices of modulations assigned to co-scheduled users sharing a common total number of streams can be swapped. This flexibility does not affect the total number of indices in the signaling table or the overall modulation scheme combinations that the table can convey.
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April 18, 2011
June 25, 2013
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